McMillin
An Irish and Scottish surname generally understood as meaning “son of the miller” or more loosely “son of the mill.”
The #6,393 most common surname in the United States (2010 Census) — about 1 in every 58,002 Americans shares it.
Etymology
This surname is usually explained as an Anglicized form built with Mac- or Mc-, meaning “son of,” plus a mill-related element. In some older sources it is glossed simply as “son of the mill,” while in practice it is often treated as a variant of names such as McMullen or McMullin, which themselves can reflect occupational or place-based origins connected with milling. The spelling has likely been reshaped over time by English spelling habits and by the movement between Irish, Scottish, and American records.
History
The form appears in Irish and Scottish surname traditions and is found in several spelling variants, especially in records from Ulster and later in North America. The name was never extremely common, but it spread through migration to the United States and Canada, where spellings such as McMillin, McMullen, and McMillen could become mixed or standardized differently in separate branches of the same family. Older lexicographers sometimes gave simplified explanations, so the exact origin may vary by family line.
Origin
Regions
Variant spellings
Fun fact
19th-century surname writers sometimes glossed McMillin very literally as “son of a mill,” showing how often occupational surnames were interpreted through familiar English words.
From the historical record
“MacMannion. rriAC itlAOil-ouin, Maclldoon. rriAC niAoilin, MacMillin, Mac- Millen. iriAc rriAoil lof a, Malise, Mellis, IllAc niAoiliji, MacMoyler, Mey-”
— Sloinnte Gaedheal is Gall: Irish names and surnames